Book and bookbinding



19, 1952 v G. WISER 2,607,614

' BOOK AND BOOKBINDING Filed A rii 27, 1948 .40 v I 2 x 5 Z INVENTOR.

601 dean w M552 J .5. Z. By

ATmE /Ey Patented Aug. 19, 1952 l 7 Guy :3, Wiser, Los Angeles, Calif.,assignor to Marador-Gorporation, Glendale, Ca-liL, a corporation ofCalifornia.

Application April 27, 194 Serial 1410. 3,435

8 Claims. (01. 281-21) e This invention relates to books and tobookbinding. It has particular utility in the new art of binding bookswith plastic covers, but it has a more general utility which will appearfrom the description.

In making books with plastic covers it is frequently useful to bond two.pieces of plastic together on the finished book orwhil'e finishing thebook. This is not difficult when the bonding occurs at the free edges ofthe cover, but becomes increasingly difficult as the attempt at bondingis made closer to the cover hinges, becoming extremely "difiicult and insome cases impossible, at and back of the hinges. It is particularlydesirable to employ high frequency induction currents for heat sealing,but when such currents are projected through the whole book, they charand degrade the paper. This has heretofore compelled me to employ lesssatisfactory methods of heating.

It is an object of this invention to bind books so that electronicheating can be employed without damage.

Another object of the invention is to bind books so that high frequencybonding may be employed even when the current must be applied near orover the binding means that hold the covers on the filler.

The objects of the invention are accomplished, generally speaking, byincluding an electrode in the bookbinding. In general a metal foilelectrode that encloses the back of the filler is satisfactory andoffers the least difliculty in application. Electrodes extending throughthe filler have also been successfully employed but are not generally assatisfactory as the foil electrode.

In the accompanying drawing,

Fig. 1 represents a book in perspective, including a foil electrode;

Fig. 2 is a section on line 22 of Fig. 1; and

Fig. 3 is a vertical section through the back of the binding.

In the figures of the drawing, the numeral Ill refers to the filler ofthe book, composed of leaves which may be bound in signatures orotherwise in accordance with any practice known to the prior art. Thenumeral 20 indicates the back of the book, which is of plastic and whichis bound over the leaves It by means of bookbinders stitches 36. Covers2|, 22 are attached to the back 29 by heat bonding at 23. Thethermoplastic materials are particularly satisfactory for such bindings.

It is undesirable in most cases to leave the stitching 3B1 exposed, so astrip of plastic 40 is 2 bond'ed'to'the back over the sti't'ching byheat. In order for this bond to be perfect, it is desirable that notonly the strip 40 shall be plasticized by the heatbut also the portionof the back 211 which lies beneath the :strip. With ordinary means whichapply their heatonly to the outside of the strip 49 this cannot besatisfactorily obtained and when high frequency electrodes 50, 50 areemployed, the energy used in' p'enetrating the book is such that theleaves'are liable to be degraded, charred, or even burned before asatisfactory seal canibe made. a

In order to overcome =thi-s dificdl-ty and-make th'e use :of highfrequency-electrodes :BU satis'factory-,9I bind within the :back 20a-foil'electrod'e' 'fi fl.

This is a piece of common foil such as tinfoil or copperfcil, or incases where cost is no object, silver foil- "This foil can be sewed, 'orstapled with plastic staples inaccordance with the general treatment ofthe book, or glued, as the case may be.

When the electrodes are brought down upon the strips 40-40, and the highfrequency current is turned on, the induction currents pass through andheat the strip 40, the part of back 29 that lies-beneath the strip, andare carried around the leaves of the book by the electrode 60. Thus, theburning that accompanied earlier practice is avoided.

It will be understood that the foil can be as extensive or as limited asdesired. as to area. It can be shaped to suit the needs of a particularbonding job. The foil electrodes are the preferred form of theinvention, but electrodes of other types can be used as long as theyachieve the end of relieving certain portions of the book from theaction of the high frequency currents.

As many apparently widely different embodiments of the present inventionmay be made Without departing from the spirit and scope thereof, it isto be understood that the invention is not limited to the specificembodiments.

What is claimed is:

1. The method of bookbinding that includes the steps of covering theback of the filler with metal foil, enclosing the back of the filler ina back composed of thermoplastic resin, sewing through the back, foiland filler with thread, covering the exposed stitches with athermoplastic material, and passing high frequency current from side toside of the book through the thread covering material, and the metalfoil.

2. The method of bookbinding that includes the steps of covering theback of the filler with an electrically conductive sheet, covering thesaid sheet with a thermoplastic back, sewing through the back, sheet andfiller, covering the exposed sewing with thermoplastic material, andpassing high frequency current from side to side of the book through thecovering material, the back and the conductive sheet.

3. The method of bookbinding that includes the steps of covering theback of a filler with an electrically conductive sheet covering thesheet with a thermoplastic back, binding the book with means penetratingfiller and thermoplastic back, and passing high frequency current fromside to side of the book through back and sheet around the filler.

4. A book including a filler, an electrically conductivesheet about theback of the filler, a

thermoplastic back for the book, and binding means, penetrating the backand filler, bonded to the thermoplastic back by thethermoplasticmaterial of the back.

5. A book including a filler, an electrically conductive idler electrodeextending from side to side of the filler, a thermoplastic backenclosing the electrode and the back of the filler, sewing meansextending through the back, electrode and filler, and thermoplasticcovering, means bonded to the thermoplastic back over the sewing.

6. The method of 'bookbinding that includes assembling a filler with'anelectrode extending from side to side thereof, enclosing the back of thefiller in a thermoplastic sheet that overlaps the ends of the electrode,passing fastening means through electrode, sheet and filler, coveringthe exposed parts of the fastening means with thermoplastic material,and applying high frequency heat thereto. 1

7. A book having filler means, a flexible electrode means extending fromside totside around the back of the filler, a, cover having a thermo- 4plastic, welded part overlying the electrode and a bound portion of thefiller, and electrically nonconductive binding means binding the coverto the filler.

h 8. The method of binding a book by means including the use of highfrequency heat that comprises applying flexible electrode means aboutthe back of the filler, overlapping the'sides thereof and extendingsubstantially throughout the length thereof subjected to high frequencyheat, applying thermoplastic cover means to the book with thermoplasticparts thereof adjacent the electrode means, and attaching the covermeans to the electrode means and the filler means by electricallynon-conductive fastening means, and passing high frequency current fromside to side of the book in those areas covered by the said electrodemeans.

GUY B. WISER.

REFERENCES .CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Great Britain July 2, 1946

